Archive for the ‘physics’ category: Page 212

Aug 24, 2016

Should We Build a Dyson Sphere?

Posted by in categories: cosmology, physics

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Aug 24, 2016

ESO confirms the discovery of Earth’s closest potentially habitable neighbour

Posted by in categories: physics, space

Astronomers have today confirmed the existence of a planet orbiting the sun’s nearest neighbour, Proxima Centauri, which has the potential to host liquid water, and therefore life.

The exoplanet in question, Proxima b, is thought to be the Earth’s closest potentially habitable neighbour, making this discovery a major landmark in humanity’s exploration of the universe.

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Aug 23, 2016

These Theoretical Propulsion Systems Might Make Interstellar Travel a Reality

Posted by in categories: physics, space travel

One of the biggest questions in physics whether or not humanity could ever really travel between the stars. Here’s how we might be able to do it.

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Aug 22, 2016

HKUST Develops Tiny Lasers that Opens New Era for Light-based Computing

Posted by in categories: computing, engineering, physics, solar power, sustainability

Congrats Hong Kong Univ.

Researchers at The Hong Kong University of Science and Technology (HKUST) have fabricated microscopically-small lasers directly on silicon, enabling the future-generation microprocessors to run faster and less power-hungry – a significant step towards light-based computing.

The innovation, made by Prof Kei-may Lau, Fang Professor of Engineering and Chair Professor of the Department of Electronic and Computer Engineering, in collaboration with the University of California, Santa Barbara; Sandia National Laboratories and Harvard University, marks a major breakthrough for the semiconductor industry and well beyond.

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Aug 22, 2016

Like Liked UnlikeA New Approach To the Hard Problem of Consciousness: A Quasicrystalline Language of “Primitive Units of Consciousness” In Quantized SpacetimeLike

Posted by in categories: mathematics, neuroscience, physics

The hard problem of consciousness must be approached through the ontological lens of 20th century physics, which tells us that reality is information theoretic and quantized at the level of Planck scale spacetime. Through careful deduction, it becomes clear that information cannot exist without consciousness – the awareness of things. And to be aware is to hold the meaning of relationships of objects within consciousness – perceiving abstract objects, while enjoying degrees of freedom within the structuring of those relationships. This defines consciousness as language – a set of objects and an ordering scheme with degrees of freedom used for expressing meaning. And since even information at the Planck scale cannot exist without consciousness, we propose an entity called a “primitive unit of consciousness”, which acts as a mathematical operator in a quantized spacetime language. Quasicrystal mathematics based on E8 geometry seems to be a candidate for the language of reality, possessing several qualities corresponding to recent physical discoveries and various physically realistic unification models.

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Aug 18, 2016

EPJ Nonlinear Biomedical Physics

Posted by in categories: biotech/medical, physics

EPJ — Nonlinear Biomedical Physics is an open access journal, published under the brand SpringerOpen, dedicated to the application of nonlinear dynamics and integrative systems science to the quantitative modeling and understanding of how structure and function as well as dysfunctions and diseases emerge in complex biomedical matter and processes. Coverage is focused on the application-driven development of theoretical, experimental and computational techniques, including relevant methodologies, instrumentation and related advanced technology.

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Aug 16, 2016

A possible cause of the Big Bang and current acceleration of the Universe

Posted by in categories: cosmology, information science, physics

We consider a solution of the Einstein equations for a system comprised of merging black holes and show that the solution contains a term which represents a repulsive force. This repulsive term is proportional to 1/r, where r is the distance from the system, and it is additional to the common Newtonian term which is proportional to 1/r2. This repulsive force acts as an effective dark energy if the total mass of the Universe is decreased.

As seen below, a shape of the gravitational potential is often illustrated by a funnel made of rubber film where a heavy ball (blue) is located in the center. In this model, a fast decrease of the gravitational mass corresponds with a sharp ascent of the ball. The film attached to the ball forms a cone-type hill in the center of the funnel. Light balls (green) on the central cone run away from the center. The central cone expands fast but keeps it exterior slope; this corresponds to long-term repulsive force.

A mechanism of the repulsive force may be applied to a model of the expanding Universe. This may imply that the Big Bang and accelerated expansion of the Universe is not related to current processes in the Universe but to a relic repulsive gravitational force or to a configuration of space-time that originates in the previous cycle of the Universe when at the last stage of a collapse the intensive generation of gravitational waves resulted in sharp decrease of the gravitational mass of the Universe. This process generated a powerful repulsive force that transformed the Big Crunch into the Big Bang. Because the repulsive acceleration decreases with time, the current Universe expands with lower acceleration. Decreasing acceleration of the Universe can be verified by observations. Gravitational waves caused by the compression of the Universe may not disappear at the stage of expansion and form the relic gravitational radiation.

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Aug 13, 2016

Innovative Transient Battery Is Designed To Self-Destruct In 30 Minutes

Posted by in categories: biotech/medical, military, physics

A Mission Impossible Battery that self destructs.

Here at HEXAPOLIS, we have talked about biodegradable electronics that are designed to automatically dissolve once their job is done. Such self-destructing devices could be especially useful in the world of medicine, where implants currently have to be surgically removed, as well as the military. As part of a new research, scientists at the Iowa State University have devised an innovative transient battery, which as its name suggests can melt away in less than 30 minutes.

Technological advancements in recent years have allowed researchers to develop an array of self-destructing electronics that are capable of performing specific functions. Up until now, however, these devices were driven by external power sources. Previous attempts to create transient batteries largely gave birth to contraptions that lacked power, stability and a substantial shelf life. More often than not, they were also quite slow in demolishing themselves. Speaking about the research, recently published in the Journal of Polymer Science, Part B: Polymer Physics, the team stated:

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Aug 13, 2016

Second layer of information in DNA confirmed

Posted by in categories: biotech/medical, genetics, physics

Leiden theoretical physicists have proven that DNA mechanics, in addition to genetic information in DNA, determines who we are. Helmut Schiessel and his group simulated many DNA sequences and found a correlation between mechanical cues and the way DNA is folded. They have published their results in PLoS One.

When James Watson and Francis Crick identified the structure of DNA molecules in 1953, they revealed that DNA information determines who we are. The sequence of the letters G, A, T and C in the famous double helix determines what proteins are made ny our cells. If you have brown eyes, for example, this is because a series of letters in your DNA encodes for proteins that build brown eyes. Each cell contains the exact same letter sequence, and yet every organ behaves differently. How is this possible?

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Aug 11, 2016

DNA dominos on a chip: Carriers of genetic information packed together on a biochip like in nature

Posted by in categories: biotech/medical, genetics, nanotechnology, physics

Abstract: Normally, individual molecules of genetic material repel each other. However, when space is limited DNA molecules must be packed together more tightly. This case arises in sperm, cell nuclei and the protein shells of viruses. An international team of physicists has now succeeded in artificially recreating this so-called DNA condensation on a biochip.

Recreating important biological processes in cells to better understand them currently is a major topic of research. Now, physicists at TU Munich and the Weizmann Institute in Rehovot have for the first time managed to carry out controlled, so-called DNA condensation on a biochip. This process comes into play whenever DNA molecules are closely packed into tight spaces, for example in circumstances that limit the available volume.

This situation arises in cell nuclei and in the protein shells of viruses, as well as in the heads of sperm cells. The phenomenon is also interesting from a physical perspective because it represents a phase transition, of sorts. DNA double helices, which normally repel each other because of their negative charges, are then packed together tightly. “In this condensed state they take on a nearly crystalline structure,” says co-author and TU professor Friedrich Simmel.

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